Organyltellurium-(IV) and -(II) dithiocarbamates: crystal and molecular structure of dimethyldithiocarbamato(2-phenylazophenyl-C,N′)tellurium(II)

Abstract

The synthesis of the (2-phenylazophenyl-C,N′)tellurium(II) dithiocarbamates Te^II(C₆H₄N₂Ph)(dtc)(dtc = dimethyl-, diethyl-, or dibenzyl-dithiocarbamate) is reported. The corresponding series of tris compounds, Te(C₆H₄N₂Ph)(dtc)₃ is also reported. ¹²⁵Te N.m.r. data indicate that the tris compounds dissociate to tellurium(II) compounds in solution and ¹²⁵Te Mossbauer data suggest that the tris compounds are better formulated as loose charge-transfer compounds Te^II(C₆H₄N₂Ph)(dtc)·R′₂NC(S)S–S(S)CNR′₂(R′= Me, Et, or CH₂Ph). The crystal and molecular structure of dimethyldithiocarbamato(2-phenylazophenyl-C,N′)tellurium(II) has been determined. The compound crystallises in the monoclinic centrosymmetric space group P2₁/_n with a= 6.225(5), b= 12.133(9), c= 21.784(14)Å, β= 92.88(5)°, and Z= 4. The refinement converged to R= 0.0517. Tellurium is in a distorted planar environment with Te–C 2.101(8), Te–N 2.340(7), Te–S 2.568(2)Å, and Te ⋯ S 3.255(3)Å. Bond angles include STeS 60.9(1), STeC 89.8(2), CTeN 72.5(3), and NTeS 136.3(2)°. No significant intermolecular contacts are observed.